How to Detect if a Car is Burning Engine Oil?
2 Answers
Methods to detect if a car is burning engine oil: Observe the color of the exhaust during cold starts or when pressing the accelerator deeply. If blue smoke is visible, it indicates the engine is burning oil. Blue smoke means engine oil has entered the combustion chamber, where it is vaporized by high temperatures and mixed with gasoline molecules before being expelled with the combustion byproducts. This occurs because oil molecules are present without undergoing any chemical reactions. Normally, after passing through the catalytic converter, exhaust should be nearly colorless with minimal odor, occasionally emitting water droplets, which signifies proper engine operation.
I've been driving for over twenty years and have extensive experience in detecting oil burning. Usually, I start with the dipstick: after stopping the engine and waiting a few minutes, pull it out to check the oil level. If the oil level drops a notch every thousand kilometers, it might be a sign of oil burning. Next, observe the exhaust pipe: during cold starts or when climbing hills, if blue or blue-gray smoke emerges, it's definitely a sign of oil burning—the thicker the smoke, the more severe the problem. The spark plugs also need checking; take them out yourself and see if there's any oil residue on the electrodes or around them. If there's obvious sticky engine oil, it proves oil is leaking into the combustion chamber. Pay attention to any abnormalities while the engine is running, such as unstable idling or a ticking sound, and a smell like burnt oil, which also indicates oil burning. It's best to regularly record the time and mileage of oil top-ups; if the average consumption exceeds 0.5 liters per thousand kilometers, be alert. In severe cases, send it for repair promptly to prevent engine damage.
